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In this work, the circular dichroisms (CD) of nanorice heterodimersconsisting of two parallel arranged nanorices with the same size but differentmaterials are investigated theoretically. Symmetry-breaking is introduced byusing different materials and oblique incidence to achieve strong CD at thevicinity of Fano resonance peaks. We demonstrate that all Au-Ag heterodimersexhibit multipolar Fano resonances and strong CD effect. A simple quantitativeanalysis shows that the structure with larger Fano asymmetry factor hasstronger CD. The intensity and peak positions of the CD effect can be flexiblytuned in a large range by changing particle size, shape, the inter-particledistance and surroundings. Furthermore, CD spectra exhibit high sensitivity toambient medium in visible and near infrared regions. Our results here arebeneficial for the design and application of high sensitive CD sensors andother related fields.

Fano resonance assisting plasmonic circular dichroism from nanorice heterodimers for extrinsic chirality